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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13232e5cd45b18d444bd0ce49b7f1e3e86ff87363f9612feb65e1ad204f856d0' 
  AND token = '5EKsL4zT+SiugX6YqsH8eyTLE1+a8XXTJCOWF1/ST+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}